Webbpsf-ext

Hotfix to make sure `bar_offset=0` for all non-NIRCam instruments.

Update requirements and import to use STPSF (https://github.com/spacetelescope/stpsf) instead of WebbPSF.

Hot fix to address behavior where `os.path.join()` will replace data directory path if you try to explicitly append '/' string.

- Fix missing mpl style file and BOSZ 2024 spectral directory.
- Add some PSF convolution convenience functions in `image_manip.py`
- Update PSF matching functions in `imreg_tools.py`

* Update CITATION.cff

* Bring up to date with `webbpsf` >1.2.0
* NIRCam flight bandpasses
* Deprecate `pysynphot` in favor of `synphot` and `stsynphot`